Working head of a sanding machine and support therefor

Claim 1

IN A SANDING MACHINE HAVING A BASE STRUCTURE INCLUDING A WORK SUPPORTING SURFACE, A GENERALLY TRIANGULAR WORKING HEAD STRUCTURE THEREFOR COMPRISING: (A) A SUPPORT HAVING AN ELONGATED BELT GUIDING MEMBER ALONG A FORWARD SANDING EDGE THEREOF AND GENERALLY AT AN APEX OF SAID TRIANGULAR STRUCTURE; (B) MEANS MOUNTING SAID SUPPORT AND SAID BELT GUIDING MEMBER ON SAID BASE STRUCTURE WITH THE LONGITUDINAL AXIS OF THE GUIDING MEMBER CUTTING THE PLANE OF SAID WORK SUPPORTING SURFACE; (C) A BELT DRIVING ROLLER MOUNTED ON ONE SIDE OF SAID SUPPORT, REARWARDLY THEREOF, FOR ROTATION ABOUT AN AXIS PARALLEL TO THE LONGITUDINAL AXIS OF SAID BELT GUIDING MEMBER; SAID ROLLER BEING MOUNTED GENERALLY AT ANOTHER APEX OF SAID TRIANGULAR STRUCTURE; (D) DRIVING MEANS ON SAID SUPPORT FOR ROTATING SAID DRIVING ROLLER; (E) A DRIVEN ROLLER MOUNTED ON THE OPPOSITE SIDE OF SAID CENTRAL SUPPORT, REARWARDLY THEREOF, FOR ROTATION ABOUT AN AXIS PARALLEL TO THE LONGITUDINAL AXIS OF SAID BELT GUIDING MEMBER; SAID ROLLER BEING MOUNTED GENERALLY AT THE THIRD APEX OF SAID TRIANGULAR STRUCTURE;